Validate Email Through RegularExpressionValidator VB.NET

 <asp:RegularExpressionValidator ID="remail"
      runat="server"
      ControlToValidate="txtemail" ErrorMessage="Enter your email"
ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*">
</asp:RegularExpressionValidator>